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Cisco GbE Single Strand Single Mode SFP

The 1000BASE-BX-D and 1000BASE-BX-U SFPs operate on a single strand of standard single-mode fibre up to 10 km. The 1000BASE-BX10-D transmits a 1490 nm channel and receives a 1310 nm signal, whereas 1000BASE-BX10-U transmits at a 1310 nm wavelength and receives a 1490 nm signal, hence must be used in pairs